Method of making thumbscrews and caps



Dec. 0, 1924. 1,520,102

J. E. DURHAM. JR

METHOD OF MAKING THUMBSCREWS AND CAPS Filed Feb. 19, 1924 INVENTOR:

B. I I I I 4 II" ATTORNE S Patented Dec. 30, 1924.

UNITED STATES PATENT ()FFICE.

JOSEPH EDWARD DURHAM, 53-, OF ALLENTOWN, PENNSYLVANIA, ASSIGNOR '10BONNEY FORGE & TQUL WORKS, OF ALLENTO'WN, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

METHOD OF MAKING THUMBSCRE'WS AND GAPS.

Application filed February 19, 1.92%. Serial No. 693,912.

T 0 all whom it may concern:

Be it known that I, Josnrr-r E. DURHAM, J12, a citizen of the UnitedStates, residing at Allentown, in the county of Lehigh and State ofPennsylvania, have invented a certain new and useful Method of MakingThumbscrews and Caps, of which the following is a specification.

This invention generally stated relates to a thumb screw and has moreespecial relation to a combined cap and swivel therefor.

The invention consists of the novel construction hereinafter describedand finally claimed.

The nature, characteristic features and scope of the invention will bemore fully understood from the following description taken in connectionwith the accompanying drawings forming part hereof, and in which:

Fig. 1, is a face view of a cap embodying the invention, showing theposition of parts to receive a thumb-screw ball.

Fig. 2, is a section taken upon line 22 of Fig. 1.

Fig. 3, is a View similar to Fig. 1, with the cap parts as positionedafter insertion of thumb-screw ball.

Fig. 4, is a view taken upon the line 4& of Fig. 3.

Fig. 5, is a View of a thumb-screw enibodying the invention, and

Fig. 6, is an end View of Fig. 5.

For the purpose of illustrating my invention I have shown in theaccompanying drawings one form thereof which is at present preferred byme, since the same has been found in practice to give satisfactory andreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of the instrumentalities as hereinshown and described.

Referring to the drawings:

In carrying out my invention I first produce by any suitable pressing,stamping or punching means, a cap 1, which is of a slightly oval shape,as to its periphery 2, and has a concave surface 3 in which is formedthe central hole 4, and the oppositely or diametrically located slots 5whose walls converge outwardly as seen in Figure 1.

The hole 4 is sufliciently spread as seen in Figure 1, so that therounded ball end 6 of the thumb screw 7 can be inserted therethrough,said ball being connected to the screw 7 by the neck 8. After theinsertion of the ball into the hole 4, the cap 1 is then compressed byany suitable mechanism, so that the diameter of the hole a is reducedand the walls of the slots are brought closer together, the hole beingnow approximately a true circle, as seen at 9 in Figure 3, and the slotsappearing as seen at 10 in said figure. with their walls nearlyparallel, the cap in its compressed condition after having beenassembled with respect to the thumb screw being indicated as 11. In thecompleted device as seen in Figures 5 and 6, the slot of the cap isclosed upon the neck 8 of the ball and thus there is formed a unitarystructure, wherein the cap is swivelled upon the screw neck and acts toprotect the screw from marring material upon which it is clamped, saidcap acting as a swivel. The cap is readily formed up out of thin sheetmetal by any suitable pressing or stamping operation, and a unitarystructure is produced by my novel method comprising the cap and swivelwhich is inexpensive to assemble, practical in its ap plication and canbe made in large quantities at a minimum of expense, and will be durableand eflicient when in use. The above described device is applicable fornumerous uses particularly where it is desired to clamp together partsto highly polished wood. By the above described arrangement of parts thecap prevents the screw from coming in contact with the wood surface tomar the same because the cap rests upon the wood surface and acts as aswivel connection for the moving screw.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is;

1. The method of making a thumb screw and cap, which consists in forminga cap having an enlarged hole and oppositely located slots, whose wallsconverge outwardly, next inserting the rounded ball end of a thumb screwhaving a neck in juxtaposition to said ball through said hole, wherebysaid cap is swiveled on said neck, and forms a unitary structuretherewith.

2. The method of making a thumb screw and a cap which consists informing a concaved cap having an oval periphery and an enlarged hole andoppositely extending slots whose walls converge outwardly, nextinserting the rounded ball end of a thumb 10 screw having a, neck injuxtaposition to said swiveled on said neck, and forms a unitary 15structure therewith.

JOSEPH EDWARD DURHAlH, JR. Witnesses:

I JESSIE M. STRAUB, OLIVER W. FREY.

